to tell on someone چغلی کردن

To "tell on someone"

means to report their misdeed to the appropriate authorities. It is generally heard among children, for whom the authorities are likely to be parents or teachers. Adults may use it light-heartedly, but in the case of serious infractions are more likely to say "I will report this" or "I plan to file charges" than "I'm telling on you."

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misdeed  ===méfait

light-heartedly  ==     de bonne humeur